Adnannagariya52/Nexus ? reverse-engineered prompt

Build me a web app for uploading and downloading files, with a simple clean dashboard where I can see what has been added, open or download items, and manage them easily.

It should feel polished and easy to use, with a modern responsive UI, a place for shared components, and working backend logic that saves data in a database. If it makes sense, include a few small helper services for handling file related tasks and make sure the app is set up so it can be run and tested locally without much extra work.

Please wire up the main screens, the upload flow, the download flow, and any basic database models needed to make it all work end to end. If you need to check current docs for anything, go ahead and look them up online.